how to fix my Toyota Highlander Third Generation (2014-2019) power locks not working

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

571 words

Problem Statement

Learn how to diagnose and fix power locks not working in Toyota Highlander (2014-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to avoid short circuits.
•Allow any electrical components to discharge before handling.

Symptoms

•No response from power lock buttons on key fob or interior switch
•Audible clicking sound from the lock mechanism when attempting to engage
•Inoperative door locks when manually operated from inside or outside
•Dashboard warning light for door locks may illuminate
•Inconsistent locking/unlocking behavior when using the remote

Diagnostic Steps

1
Check the key fob battery and replace it if weak or dead.
2
Inspect the interior power lock switch for damage or malfunction.
3
Use an OBD-II scanner to check for any related error codes.
4
Verify the condition and connections of the door lock actuators.
5
Inspect the wiring harness and connectors for shorts or corrosion.
6
Test the fuse related to the power lock system in the fuse box.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Multimeter
•Screwdriver set
•Trim removal tools
•Socket set
•Fuse puller
•Small flathead screwdriver

Parts Required

•CR2032 key fob battery
•Door lock switch (if faulty)
•Door lock actuator (if faulty)
•Replacement fuse (if blown)

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Symptoms

•No response from power lock buttons on key fob or interior switch

•Audible clicking sound from the lock mechanism when attempting to engage

•Inoperative door locks when manually operated from inside or outside

•Dashboard warning light for door locks may illuminate

•Inconsistent locking/unlocking behavior when using the remote

Diagnostic Steps

1
Check the key fob battery and replace it if weak or dead.
2
Inspect the interior power lock switch for damage or malfunction.
3
Use an OBD-II scanner to check for any related error codes.
4
Verify the condition and connections of the door lock actuators.
5
Inspect the wiring harness and connectors for shorts or corrosion.
6
Test the fuse related to the power lock system in the fuse box.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Disconnect the negative terminal of the battery to ensure safety while working on electrical components.

2. Replace Key Fob Battery

Tools Required: Small flathead screwdriver, new CR2032 battery.
Open the key fob using the screwdriver and replace the old battery with a new CR2032.
Reassemble the key fob and test the locks.

3. Inspect and Replace Power Lock Switch

Tools Required: Screwdriver set, trim removal tools.
Remove the door panel using trim removal tools to access the power lock switch.
Disconnect the switch connector and test for continuity using a multimeter.
If faulty, replace with a new switch and reassemble the door panel.

4. Check and Replace Door Lock Actuators

Tools Required: Socket set, screwdriver set.
Remove the interior door panel to access the door lock actuator.
Disconnect the actuator wiring harness and remove the actuator from the door.
Install a new actuator by reversing the removal steps and reconnecting the wiring.

5. Repair Wiring or Connectors

Tools Required: Multimeter, wire strippers, soldering iron (if necessary).
Inspect wiring for frays or damage and repair as needed.
Clean any corroded connections with electrical cleaner and reconnect.

6. Replace Fuse

Tools Required: Fuse puller or needle-nose pliers.
Locate the fuse box, remove the cover, and check the power lock fuse.
Replace with a new fuse of the same amperage if blown.